Belting



Nov. 6, 1928.

F. o. MARSHALL BELTING Filed May 2, 1925 Patented Nov. 6, 1928.

UNITED STATES raanx o. MARSHALL, or cnrcneo, innrnois.

BELTINQ.

ap lication filed lay 2, 19,26, Serial 1'... 27,350.

edges. A further object is :to provide means i0:- preventing the belt from climbing the flange of the pulley with which it cooperates.

I obtain my obieots by the construction ilin the accompanying drawings in whi- Figure 1 is a perspective View of a portion of belting embodying my invention. One part of the belt is left uncemen-ted and unatapled to shown one of the pomible constructions, viz in which thebeltingis folded at the edges, thus producing a finished edge in distinction to a raw edge, as would be the case if the different plies were made of sep-,

arate individual layers.

F are 2 "is a transverse sectional View on the line 2 2 Figure 1. 7

Fi ure 3 is a transverse sectional view of the gelting showing the same in position 11 on the flange ofjthe pulley. The view slibws a fragment of he Pulley on a diametral plane+that is, the plane in which heis at he Pu lies Like numerals denotelike parts througout the several views.

In the form selected-to w one type of belting inwhich inventionmay be incorporated, the beltin is four ply and is composed of two folded eets 1, 2 of duck or other woven fabric. These sheets or strips are folded edge to edge, and then laid one u on theother in the manner shown. By pre erence the parts are so arranged that the meeting edges of one strip will be ofiset from the edges of the other strip, and all of the meeting edges will come on the inside of the belting so that the belting shall resent a smooth and continuous outer sur ace on Sid mann r of told-1.1g is essential, however, and may be varie Between the difierent layers of fabric are intervening layers 3 of flexible cement or adhesive. While I do not wish to confine myself to any specific type of adhesive, I have found that balata gum has the necessary. and desirable characteristics. The parts are consolidated, usually by heat and pressure, sov thatthe fabric is more or less impregnated with .the adhesive and a unitary structure is produced. I

In addition to the adhesive I apply staples or stitching 4. These fastenin devices, which I shall term staples are 0- wire and are clenched on the opposite face of the structure. The staples run crosswise of the belt and in the form illustrated are arranged in two rows parallel to each other and parallel and adjacent to the edges of the belt. Of course the number of longitudinal rows of staples may be varied in accordance with the width of the belt, but for the sake of illustration it may be said that a belt having a width of five inches may be provided with staples approximately a half an inch long and so arranged thatthere is a space 6 of two inches at the center of the belt which is un stapled. In the form illustrated the staples in a given longitudinal row arespaced' closer togther than the length of a staple. Fur

thermore the staples are comparatively rigid so as to oppose any sharp transverse flexure of the belt at the edges.

\Vhile my belting maybe used for various purposes, it is especially useful where there is an unusual degree of wear and tear, for example, axle driven carlighting systems. It will be understood that in one well-known type of car lighting system there" is an electric generator mounted upon the car body and this is driven from a pulley mounted on one of the axles of the car. In this situation the belt' is not-only subjected to great variations in rateof speed, but is also constantly subjected to the action of dirt and grit, which is'fanned up from the road bed, and is also subjected to great changes of temperature, from the hot days of summer'to the cold days of winter. More important still, however, is the fact that in going around curves the axle changes itsdirec tion relativel to the car :b'odyan'd hence the axis of the riving pulley does not remain parallel to the axis of the driven pulley. This has been the source of muchtrouble and expense in axle-driven car-lighting systems. The curves are frequently sharp and cause a pronounced variation from parallcL ism between tlie axesof the two pulleysfand this creates a strong tendency for the belt to flange, that is to ride up upon thefiange of one or both of the pulleys. This fre'-' quently causes the belt to be thrown off, and invariably causes very rapid wear at the edges. VVhen my belt ernployedthe l1feof the belt is greatly prolonged, in fact is practically doubled; Itkis, my; understanding .thatwthese advantages result largely from the fact that the 'marginal row of staples prevent transverse bending ofwthe. belt atthe. edges with "the result that the.

belt cannotstart to creep up the sideof .the

flange. In otherwords, my belt is so stiff? attheedges, that it remains approximately fiatand whence maintains itself; in contact with the crowned surface-of the pulley and is; prevented front creeping up the side .of the j flangei This has n the double advantage of keeping .thebelt onthe pulley and. preventing the belt from .being unduly. stretched and frayed at'the edges; Itl-is'at the edges of the ordinary belting where the' wear is greatest, and by largely eliminating the wear atthispoint the life of the belt is greatlydncreased. Ibelievealso'that the increase in durability isdue partlyto the cooperation of the-staples with the adhesive to'prevent the friction of one lamination 0r ply upon its fellows. 1 This reduces the amountof worktent .t hat it will be forced out frOmLthe laminations and lost ll itlra belt stapled like mine the staplescooperate with the adhesive and permanently: hold the structure in single unitary l and consolidated form. Furtherinorethestaples theinselve's,'being metallic,

reduce, the amount of .wear dueto contact with the pulleys, and this also tends'to prolong the lifeof the belt: y p 1 Asttheiinidwidthportion, of the belt is free from staples, the belt is transversely flexible, and readily-conforms to the transverse curvature or crowning of thepulley.

Having thusdeseribed my invention what I claim. as new and desire to-secure by Let'- tersPatentis: 1.

1. A belt of the following proportions and construction; the'same being formed of multi.-ply gum impregnated; :fabric approxima-tely five inches in width and formed with a longitudinally extending unstitched center of about two inches in width, there being on each side of such center wire stitches each about one half inch in length arranged in two longitudinally and transversely extending spaced apart rows, the outermost row being spaced from the edge and the stitches in said rows bein g spaced apart longitudinally slightly less than the length of a stitch.

2. A belt formed of flexible material, provided withrelatively long and narrow and substantially rigid stiffening elements, sa d elements being disposed in parallelspaced apart. rows extending both' longitudinally and transversely of the belt said rows belng sufficiently spaced apart longitudinally: of

the belt to permit the same to freely flexin the longitudinal direction, and said transverse. rows being disposed transversely of the belt: to: prevent the opposed longitudinal marginaliar eas from flexing in a transverse direction while permitting the belt to flex in term'ediate said marginal areas in a trans verse direction to conform to the crown ofa pulley when applied thereto.

'3. .A belt composed-of folded layers of woven fabric arranged with the closed folds of the tubesat the longitudina'l rnargins of therbelt, and saidfabricbeing imprc ated with flexible gum, said belt being stiffened transversely but not longitudinally by: wire stitches, said stitches being-disposed elong the longitudinal marginsof the belt but spaced-from tl1e1edges so as to leave "said edges free, and said stitches lying in both longitudinal and transversely extending'par allel rows spaced apart 'botlr longitudinally and transversely of the belt; the" length and rigidity of the stitches at them rgins holding such portions from flexing transversely.

4:. A belt of flexible" material stifi'ened transversely along its longitudinal edges by transverse parallel rows i of wire stitehin said rows being mllel and spaced silll i ciently apart longitudinally ofthe'belt so as to preserve the longitiidinal flexibility of the belt and said transverse rows being-con structed and arranged to preinit the belt to flex across its intermediate width toconform to a crowned pulley when applied thereto while preventing the longitudinal marginal portions of thebclt' from flexing transversely.

5. A belt' composed of 'inulti-ply fabric impregnated-with "gum and provided with -tow longitudinal rows of relatively long and narrow and substantially rigid stiffening elements adjacent each longitudinal edge if of the belt, the elements of 'eaclrrow lying transverse of the belt and being parallel and spaced ap'art longitudinally "slightly less than the length of an element.- 1

16.A beltg onsistingof astrip drywaven fabric impregnated-with flexible' lgu n provided with Wire staples arranged in rows adjacent to the edge of the belt with the staples running transversely thereto and spaced at sufficient intervals to preserve the longitudinal flexibility of the belt while. also imparting a transverse stiffness tothe belt, said staples being forced through the fabric after the manner of Wire stitching thereby avoiding the cutting away of the fibers of the fabric.

In witness whereof, I have hereunto subscribed my name.

FRANK O. MARSHALL. 

